Anion transport through polymer inclusion membranes facilitated by transition metal containing carriers

Joseph S. Gardner, Quinn P. Peterson, Jedediah O. Walker, Bryce D. Jensen, Bibhutosh Adhikary, Roger G. Harrison, John D. Lamb

Research output: Contribution to journalArticle

40 Scopus citations

Abstract

New polymer inclusion membrane (PIM) carriers to facilitate membrane transport of anions have been prepared consisting of bis(pyridylmethyl)amine compounds coordinated to transition metal ions (Fe3+, Cu2+, Zn2+). One of the carriers is based on a resorcinarene bonded to four bis(pyridylmethyl)amines. These carriers have been included in cellulose triacetate (CTA) based PIMs to study competitive transport among halides (F-, Cl-, Br-, I-) and oxoanions (SO42-, SeO42-, NO3- and ReO4-). Several compounds, tris(2-butoxyethyl) phosphate, dibutyl phthalate and ethylbenzoate, ethyl phthalyl ethyl glycolate and benzoic acid 2-ethoxyethyl ester, were used as plasticizers in the membranes to provide solubility of the metal carrier complexes. Separations were performed with and without antiport anions. Permeabilities of oxoanions increased with the use of 0.05 M KCl as an antiport solution. In some cases, Cl- was selectively transported over F-, Br- and I- in contradiction to the usual Hoffmeister-based selectivities. Excellent ReO4- transport over NO3-, SO42- and SeO42- was observed for certain systems. Permselectivity for ReO4-/NO3- was 312 for a PIM using ethyl phthalyl ethyl glycolate as plasticizer, zinc complex as carrier and an antiport solution of 0.05 M KCl.

Original languageEnglish (US)
Pages (from-to)165-176
Number of pages12
JournalJournal of Membrane Science
Volume277
Issue number1-2
DOIs
StatePublished - Jun 1 2006

Keywords

  • Anion transport
  • Facilitated transport
  • Plasticizer
  • Polymer inclusion membranes
  • Resorcinarene

ASJC Scopus subject areas

  • Biochemistry
  • Materials Science(all)
  • Physical and Theoretical Chemistry
  • Filtration and Separation

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